Merge branch 'bpf-map-in-map'

Martin KaFai Lau says:

====================
bpf: Add map-in-map support

This patchset adds map-in-map support (map->map).
One use case is the (vips -> webservers) in the L4 load balancer so
that different vips can be backed by different set of webservers.

Please refer to the individual commit log for details.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index da8c64ca8dc9..2ae39a3e9ead 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -50,6 +50,7 @@ struct bpf_map {
 	const struct bpf_map_ops *ops;
 	struct work_struct work;
 	atomic_t usercnt;
+	struct bpf_map *inner_map_meta;
 };
 
 struct bpf_map_type_list {
@@ -276,6 +277,8 @@ int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
 				 void *key, void *value, u64 map_flags);
 void bpf_fd_array_map_clear(struct bpf_map *map);
+int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
+				void *key, void *value, u64 map_flags);
 
 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
  * forced to use 'long' read/writes to try to atomically copy long counters.
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 0539a0ceef38..ce6f029ac368 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -96,6 +96,8 @@ enum bpf_map_type {
 	BPF_MAP_TYPE_LRU_HASH,
 	BPF_MAP_TYPE_LRU_PERCPU_HASH,
 	BPF_MAP_TYPE_LPM_TRIE,
+	BPF_MAP_TYPE_ARRAY_OF_MAPS,
+	BPF_MAP_TYPE_HASH_OF_MAPS,
 };
 
 enum bpf_prog_type {
@@ -152,6 +154,7 @@ union bpf_attr {
 		__u32	value_size;	/* size of value in bytes */
 		__u32	max_entries;	/* max number of entries in a map */
 		__u32	map_flags;	/* prealloc or not */
+		__u32	inner_map_fd;	/* fd pointing to the inner map */
 	};
 
 	struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */